Adjustable end head for dynamo-electric machines.



E. MATTMAN.

ADJUSTABLE END HEAD FOR DYNAMO ELECTRIC MACHINES,

APPLICATION FILED SEPT. 24,1906.

1,122,213. Patented D0.22,191

" 1mm HM;- I;

r v r comparatively large variation in the UNITED STATES PATENT orrron.

EMIL ll/IATTMAN, 0F NORWOOD, OHIO, ASSIGNOR; BY MESNE ASSIGNMENTS, TOALLIS- CHALMERS MANUFACTURING- COMPANY, A CORPORATION OF DELAXVARE.

ADJUSTABLE END HEAD FOR DYNAMO-ELEC'IRIC MACHINES.

Specification of Letters Patent.

Application filed Sentember24, 1906. Serial No. 336,005.-

To aZZ whom it may concern it known that I, Earn. MATTMAN, citizen ofthe Republic of Switzerland, residing at la'orwood, in the county ofHamilton and State of Ohio, have invented certain new and usefulImprovements in Adjustable End Heads for Dynamo-Electric Machines, ofwhich the following is a full, clear, and enact specification.

My invention relates to dynamo-electric machines and particularly to theso-called self-contained machines or to those machines the shafts ofwhich are mounted in the bearing-housings or end-heads.

In some machines such as induction n10- tors, it is necessary that theair gap be made very small in order that the eiticiencies may be as highas possible. The length of the air gap of such a machine dependsprincipally upon the size of the machine, varying from about twelvethousandths of an inch for small machines to about eight hundredths ofan inch for large machines. Therefore in case the parts are not veryaccurately machined or assembled the length of the air gap is notuniform at all parts of the rotor. In the small machines a very slightinaccuracy in machining causes a air gap at opposite sides of the rotor.Furthermore the wearing away'of the bottoms of the bearings causes theair gap at the bottom of the machine to become less than at the top.This is particularly true of large machines having rotors ofconsiderable weight.

The attraction between, the stator'and rotor is proportional. to thelength of the air gap and therefore when the air gap at different partsof the machine is. unequal the attractions at those parts are unequal.Consequently if the rotor is not accurately centered when the parts areassembled or if the lower parts of the bea rings have been worn awayeven a. slight amount resulting in a smaller air gap at the bottom ofthe rotor than at the top, the attraction between the stator and rotorat the bottom much greater than at the top. This unequal attractioncauses a pressure on the bearings in addition to that due to the weightof the rotor. As the difference in the air gap at the top and bottomincreases, the abnormal pressure increases results in a rapid wearingaway of the bearings. The result is that the machine soon becomesuseless unless the bearings are vision for adjusting the from time totime replaced. in the sell contained machines there is usually noproshaft bearings, and no means for centering the rotor. (onsequently ifon account of inaccuracies of machining the rotor is not centered whenthe parts are originally assembled, the eiliciency of the machine islow, operation unsatisfactory. and the life of the machine'cmnparativelyshort, and even if the rotor is accurately centered when originallyassembled it can only be maintained so by replacing the bearings fromtime to time.

The object of my invention is to provide means whereby the position ofthe rotor can, when necessary, be adjusted so as to equalize the torqueat all parts of the ma chine.

In carrying out my invention, I provide means for adjusting theend-housings of. the machine.

More specifically considered my invention consists in providingadjustable bushings for the bolts which secure to the machine theLi'lt'l-llOUSlDgS or the end-heads in which the shaft bearings aremounted. 'VVith this construction the end-housings can at any time beadjusted so as to adjust the position of the rotor.

For a better understanding of my invention reference is had to theaccompanying drawings in which- Figure is an elevation of a machineequipped with my invention, parts being broken away and in section; Fig.2 is an end view of the same; Fig. 3 is an enlarged end view of :1Vportion of the machine showing one of the adjustable bushings; and Fig.l is an enlarged transverse section through one of the ends having boltsand adjustable bushings.

Referring now to figures of the drawing I have shown at 10 a stationaryfield frame. or yoke carrying on its inner side the core 11 on which aremounted the stator windings 12.

At 13 is shown the rotary member which is adapted to rotate within thestator core 11. The particular machine illustrated is an induction motorhaving a very narrow air gap as is shown in Fig. 1. Secured to each endof the field frame or yoke by bolts it is an end-housing or end-head 15,provided in this case with radial arms 16. and a bearing housing 17integral therewith. The boar- Patented Dec. 223. 1914i.

ing-housings support the shaft-bearings 18 inwhich is mounted the rotaryshaft 19.

In order to provide means for adjusting the end-housings or end-headsand hence the shaft and rotor, to center the latter so that the air gapmay be made equal at all parts ofthe rotor, I provide in theend-housings for each boltan adjustable eccentric bushing or sleeve 20.Each eccentric bushing is provided on the exterior of the end-head, witha flange, 21 to which a socket Wrench or other tool may be applied forthe purpose of adjustment.

.When it is desired to adjust the position of the shaft and rotor, thebolts 14; are first slightly loosened and the eccentric bushings 2-0 canthen be rotated in the proper direction by a suitable tool until therotor is 1n the desired position. After the bushings are adjusted thebolts ll are again tightened into position so as to hold the bushingsand housings firmly in place.

I do not wish to be confined to the details shown, but aim inmy claimsto cover all modifications which do not involve a departure from thespirit and scope of my in-- .or yoke, end-heads carrying shaft bearings,

bolts for securing the end-heads to the frame or yoke, and adjustableeccentric bushings surrounding said bolts 'whereby the positions of theend-heads and shaft bearings may be adjusted.

3. In a dynamo-electric machine, a frame copies of this patent maylie-obtained for five cents each, by addressing the Commissioner ofPatents,

or yoke, end-heads, a shaft mounted in said end heads, bolts forsecuring the end-heads and the frame or yoke together, and seem-- anend-head, a shaft rotatable in said endhead, and means for adjusting therelative positionsof said frame and said end-head,

said means comprising a plurality of rotatable eccentrics mounted onsaid frame and in engagement with said end-head.

6. In a dynamo-electric machine, a frame, an end-head, a shaft rotatablein said'endhead, and means for adjusting the relative positions of saidframe and said end-head, said means comprising a rotatably mountedeccentric supported by one of said parts and in engagement With anotherpart.

7. In a dynamo-electric machine, a frame, an end-head, a shaft rotatablein said endhead, and means for adjusting the relative positions of saidframe and said end-head, said means comprising a rotatably mountedeccentric in engagement with said end- In testimony whereof I aifix mysignature, in the presence of two Witnesses.

EMIL MATTMAN.

Witnessesz ARTHUR F. KWIS, FRED, J. KINSEY- Washington, D. C.

